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Liquid crystal display device
Inactive Publication Date: 2005-08-04
FUJIFILM CORP
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[0012] An object of the invention is to obtain a liquid crystal display device which can reduce necessary electric power, increase response speed and improve viewing angle properties, and which enables to display a high-quality image at a low electric power consumption.
[0032] Also, a wide viewing angle can be attained by constituting the optically anisotropic layer by the discotic compound and controlling the average inclination angle of the disc plane of discotic compound within a range of from 25 to 35°.
[0034] The response speed and the viewing angle properties can be improved by combining the bend orientation mode liquid crystal cell and the elliptically polarizing plate. It has been difficult with high-speed liquid crystal modes such as IPS to realize a high-speed response and a high increase in number of pixels at high levels since to increase the number of pixels causes reduction in opening ratio of the liquid crystal cell, resulting in serious reduction in luminance. However, the bend orientation mode gives a higher opening ratio than IPS, and hence it is a liquid crystal mode easily made adapted for increasing the number of pixels. Further, it can permit a high-speed charging and, therefore, when combined with a low-temperature polysilicon TFT which can realize a high opening ratio, it can realize a high-speed response and a high increase in number of pixels at high levels.
Problems solved by technology
However, an optical compensatory sheet composed of a conventional stretched birefringent film shows only an insufficient optically compensating function in the bend orientation mode liquid crystal display device.
Further, JP-A-11-316378 describes that examination of the use of an optical compensatory sheet containing a discotic compund in the bend orientation mode liquid crystaldisplay device revealed the problem that a light of a particular wavelength is leaked to cause coloration on a displayed image.
However, in the case where such low-temperature polysilicon TFT is used in the above-mentioned bend orientation mode liquid crystal cell, the conventional optical compensation film fails to attain a sufficient improvement of a viewing angle when it is intended to improve the viewing angle by the optical compensatory film.
Method used
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[0149] 45 parts by weight of cellulose acetate having an average acetylation degree of 60.9%, 3.62 parts by weight of a retardation increasing agent to be described below, 232.72 parts by weight of methylenechloride, 42.57 parts by weight of methanol and 8.50 parts by weight of n-butanol were mixed at room temperature to prepare a solution (dope). The thus-obtained dope was cast in a dry thickness of 50 μm using a band castingmachine of 6 m in effective length to conduct tenter stretch-filming, followed by drying.
[0150] In-plane retardation (Re2) at a wavelength of 632.8 nm and retardation (Rth2) in the thickness direction of the thus-obtained cellulose ester film (SE1) were measured using an ellipsometer (M-150; made by Nihon Bunko K.K.), and were found to be 20 nm and 95 nm, respectively.
(Formation of Orientation Membrane)
[0151] An undercoating gelatin layer was provided on a transparent suppor...
[0157] 45 parts by weight of cellulose acetate having an average acetylation degree of 60.9%, 3.62 parts by weight of the retardation increasing agent, 232.72 parts by weight of methylenechloride, 42.57 parts by weight of methanol and 8.50 parts by weight of n-butanol were mixed at room temperature to prepare a solution (dope).
[0158] The thus-obtained dope was cast in a dry thickness of 100 μm using a band castingmachine of 6 m in effective length to conduct tenter stretch-filming, followed by drying.
[0159] In-plane retardation (Re2) at a wavelength of 632.8 nm and retardation (Rth2) in the thickness direction of the thus-obtained cellulose ester film (SE2) were measured using an ellipsometer (M-150; made by Nihon Bunko K.K.), and were found to be 44 nm and 167 nm, respectively.
(Formation of Orientation Membrane)
[0160] An orientation membrane was formed in the same manner as with the orientation ...
[0163] 45 parts by weight of cellulose acetate having an average acetylation degree of 60.9%, 3.62 parts by weight of the retardation increasing agent, 232.72 parts by weight of methylenechloride, 42.57 parts by weight of methanol and 8.50 parts by weight of n-butanol were mixed at room temperature to prepare a solution (dope).
[0164] The thus-obtained dope was cast in a dry thickness of 80 μm using a band castingmachine of 6 m in effective length to conduct tenter stretch-filming, followed by drying.
[0165] In-plane retardation (Re2) at a wavelength of 632.8 nm and retardation (Rth2) in the thickness direction of the thus-obtained cellulose ester film (SE3) were measured using an ellipsometer (M-150; made by Nihon Bunko K.K.), and were found to be 35 nm and 134 nm, respectively.
(Formation of Orientation Membrane)
[0166] An orientation membrane was formed in the same manner as with the orientation m...
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Abstract
The present invention provides a liquid crystaldisplay device that requires a reduced power consumption, which shows improved response speed and improved viewing angle properties, and that can give high-quality image display at low power consumption, and the liquid crystaldisplay device of the present invention comprises a bend orientation mode liquid crystalcell using a low-temperature polysilicon TFT; and two polarizing plates disposed on both sides of the liquid crystal cell respectively, wherein at least one of the two polarizing plates is an elliptically polarizing plate comprising: a transparent protective layer; a polarizing layer; a transparent support; and an optically anisotropic layer comprising a discotic compound, in this order from outside of the liquid crystal cell, an inclination angle between the disc plane of the discotic compound and the transparent support plane is within a range of 25 to 35 degrees on the average, and the optically anisotropic layer has a Re1 retardation value measured in front of the face of 25 to 50 nm.
Description
TECHNICAL FIELD [0001] This invention relates to a bend orientation mode liquid crystal display device using a low-temperature polysilicon TFT. BACKGROUND ART [0002] Liquid crystal display devices (LCD) are much more advantageous than CRT (CathodeRay Tubes) because of their small thickness, light weight and low power consumption. The liquid crystal display device comprises a liquid crystal cell and a pair of polarizing elements disposed on both sides of the cell respcecively. The liquid cell comprises rod-like liquid crystalline molecules, two substrates for encapsulating them, and electrodes for applying a voltage to the rod-like liquid crystalline molecules. In order to orient the encapsulated rod-like liquid crystalline molecules, the two substrates have an orientation membrane. [0003] In order to remove coloration of an image displayed on the liquid crystalcell, an optical compensatory sheet (retardation plate) is often provided between the liquid crystal cell and the polarizi...
Claims
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Application Information
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